Crushing machine



-'March 7, 1944.

E. 'l'. PETERSON CRUSHING MACHINE Filed Oct. 15, 1941 3 Sheets-Sheet 1March 7, 1944.

E. T. PETERSON CRUSHING MACHINE Filed OCt. 13, 1941 3 Sheets-Sheet 2gllwcnhw Ef-cl'. PETERSON CRUSHING MACHINE March 7, 1944.

3 Sheets-Sheet 5 Filed Oct. 13, 1941 Patented Mar. 7, 1944 UNITED STATESPATENT OFFICE CRUSHING MACHINE I Edward T. Peterson, Reading, Pa.

Application October 13, 1941, Serial No. 414,895

6 Claims.

The invention relates to a machine for crushing material, such as ironore, stone or the like, and more particularly to a jaw type thereof.

An object of the invention is the provision, in a crushing machine, of apair of jaws one of which is adapted to move relative to the other so asto break down any material that may be interposed or positioned betweenthe jaws.

Another object of the invention is the provision, in a crushing machine,of a swing or movable jaw actuated through the medium of a plurality oftoggle arms by a pitman journaled on an eccentric axle. V

A further object of the invention is the provision, in a crushingmachine, of a rod type pitman which is vertically movable and adapted toimpart a rotary and substantially horizontal movement to a swing jaw.

An added object of the invention is the provision of particularlydisposed surfaces on jaws of a crushing machine so as to increase theefficiency of the crusher as well as prolongthe service life thereof.

These and other objects of the invention will become apparent from thesucceeding description and by referring to the accompanying drawingswhich disclose an exemplified form of the invention and wherein:

Figure 1 is a plan view of a crushing machine illustrating a form of theinvention,

Figure 2 is a partial end elevational View and a partial transversecross sectional view of the crushing machine taken along the lines 2-4of Figure 1, looking in the direction of the arrows.

Figure 3 is a longitudinal sectional view of the crushing machine taken,along the lines 3-3 of Figure 2, looking in the direction of the arrows.

Figure 4 is a transverse sectional view of a por tion of the crushingmachine taken along the lines 4-4 of Figure 1, looking in the direction,of the a arrows.

Referring now in detail to thedrawings wherein like reference charactersindicat like parts,. the numeral l is employed to designate, in ageneral manner, a type of crushing machine embodying the presentinvention. The crushing machine comprises main or side walls 2 spacedtransversely of" the machine and extending, parallel to one anotherthroughout the entire length thereof. Each side wall is formed by avertically disposed web 3 having, extending outwardly therefrom, apcripheral flange 4, the lowermost of which is suitably apertured toaccommodate anchor means of any description and characterized in thepresent construction by bolts 5 which are imbedded in a foundation 6underlying and supporting each side wall to maintain each side wall in apredetermined fixed position.

What may be considered the front or forward and adjacent extremities ofthe side walls are joined by a forward beam, bulkhead or bridge 1,preferably forming a portion of a jaw 8 of the crushing machine anddesirably the stationary jaw thereof since it remains fixed relative tothe side walls of the housing. The forward bulkhead is substantiallyskeletonized in form, being made up of longitudinally or horizontallyspaced front and rear Vertical webs 9 and II], respectively, which arejoined adjacent their extremities by spaced top and bottom webs H and lland end webs l2. The end Webs of the front bulkhead lie adjacent to andare in surface bearing relation with the side wall Webs. The front andrear bridge webs are further joined by vertically positioned andhorizontally disposed reinforcing or connecting intermediate webs [3which merge with the end webs of the bulkhead.

Since any crushing forces exerted against the stationary jaw will tendto urge it horizontally or longitudinally of the crushing machine awayfrom between the side walls thereof, shear lugs it are formedoutstanding from the end webs I2 to extend into suitable oraccommodating grooves l5 facing inwardly of the housing from the sidewall webs. As will be noted, the side wall webs are bulged or extendedin thickness, as at I6, adjacent the area of the grooves to compensatefor the latter and build up the side walls to their original capacitybecause of the otherwise weakening effects of the grooves. The frontbulkhead is retained in position by means of a plurality of tie rods I!which extend through bosses 18 formed on and outstanding from the sidewall webs and aligned apertures 19 in the bulkhead end webs. The bossesextend to substantially the horizontal limits of the respective sidewalls to present appreciable bearing areas for the tie rod extremities.

Positioned on the forward bulkhead and desirably in bearing relationwith the front web thereof is a plurality of wear plates 20 forming apart of the stationary jaw and comprising interchangeable upper andlower wear plates 2i] and an intermediate wear plate 29*. The upper andlower wear plates each have a material engaging surface 2! and theintermediate wear plate has a material engaging surface 2P all of whichface inwardly of the housing and are corrugated or sinuous in horizontalcross section for the purpose to be hereinafter explained. The

surfaces 2| of the upper and lower wear plates are inclined verticallyof the crushing machine from a position commencing at the verticallimits of the wear plates to be tapered at a slight angle outwardlytoward the bulkhead and terminate adjacent the contiguous edges of theupper and lower wear plates and the intermediate Wear plate. The surfaceZi of the intermediate wear plate is also tapered and is in alignmentwith the inner extremities of the upper and lower wear plate surfaces.The vertical disposition of the Wear plate surfaces presents upper andlower sections of identical configuration and since, during service, thelower section or wear plate is subjected to the greatest wearing forces,the upper and lower wear plates are thus made reversible orcounter-parts of one another so that, after a prolonged use of the wearplates in their illustrated position, the upper and lower wear platesmay be turned end for end or reversed so as to locate the relativelyworn lower wear plate in the location occupied by the illustrated upperwear plate and the relatively worn upperwear plate at the positionoccupied by the lower wear plate. The intermediate section may alsob'e-inverted if it is found that the lower extremity thereof has beenworn to such a degree as to warrantthis procedure. By this arrangementand construction, it will be noted that the service life of the crushingmachine will be greatly increased or augmented.

Various means may be employed to aiiix the wear plates to the bulkhead,and a exemplary of-one means there is disclosed a, top wedge 22interposed between the bulkhead top web l I and the upper extremity ofthe upper wear plate to prevent an inward and upward shifting of thiswear plate from a predetermined position. The top wedge is locked inplace by means of bolts 23 which extend through the bulkhead. Aplurality of aligned bolts 23 spaced below the bolts 23 extend throughthe upper wear plate and bulkhead to retain the lower extremity of theupper wear plate in place. A plurality of bolts 23 removably secures theintermediate wear plate to the bulkhead. Depending from the lower web ofthe bulkhead is a reinforcing flange 24 provided with an inwardlyopening keyway 25. Bearing against and secured to the flange is a "toelug 26 which locks the lower extremity of the lower wear plate against adownward and inward movement to assist in fixedly securing this wearplate in place. The toe lug is provided with a shoulder or key 21 formedintegral therewith which extends into the keyway so as to substantiallyrelieve rivets 28, which secure the toe lug to the flange, of anyservice stresses. Since the upper and lower wear plates may, due totheir being subjected to transverse or lateral thrusts, tend to shiftfrom their illustrated position, there have been provided verticallyspaced shear lugs or lips 29 so as to outstand from the side of the wearplates opposed from the sinuous surface carrying side thereof to projectinto suitable or correspondingly formed recesses or reliefs 30. It willbe noted that the wedg 22 and toe lug 26 are set back or spaced awayfrom the material wearing surface of the wear plate material engagingsurfaces 2 I, and accordingly the wear plate may be worn down aconsiderable extent before the material deposited in the machine ispermitted to contact and wear the wedge and toe lug. Bolts 23 alsoassist in maintaining the lower wear plate in a, predetermined position.

'. Spaced inwardly of the crushing machine from the forward bulkhead orstationary jaw is an auxiliary axle or shaft 3| seated in suitablebearings 32 provided in the side walls adjacent the upper limits andintermediate th extremities thereof. Each bearing 32 has an upper capportion 32 pivotally connected to the side wall at its one extremity, asat 32", while the other extremity 320 is provided with cap bolts 32 andby reason of this construction the cap bolts employed are removed fromthe area, where the material to be crushed enters the machine. The axleis provided, at its extremities, with centering rings slightly recededin the frame so as to position the shaft when rebabbiting in the fieldand which are employed to position the axle in a predeterminedhorizontal alignment. Locking nuts 33 are associated with each shaftextremity to-bind the side walls together and prevent a horizontalshifting of the axle respectively. Pivotally mounted on the auxiliaryaxle and adapted to oscillate relative thereto is a swinger movable jaw34 which desirably comprises a top bearing 35 encircling the auxiliaryaxle. Depending from opposite sides of the top hearing are spaced frontand rear walls 36 and 31, respectively, which merge adjacent the lowerextremity of the swing jaw to continue'as a flang .typeshelf 38. Thefront and rear walls. are joined intermediate their height by aplurality of stiffening partitions 39. The jaw walls are desirablyinclined away from the vertical plane of the auxiliary axle in adirection toward the stationary jaw so that the two jaws may present ahopper or'receiving chamber 40 into which the material to be crushed isto be deposited. Further, since the center of mass of the swing jaw isout of vertica1 alignment with the axis of the auxiliary axle, the

tendency of the swing jaw, assisted by the weight of the materialbetween the jaws, is to move away from the stationary jaw so that noadditional means is required for opening the jaws in permitting thematerial to be crushed to assume a lower position in approaching thedelivery or lower extremity of the hopper.

Bearing against the front jaw Wall 3d are a plurality of wear plates Mwhich afford a jaw facing surface 42 sinuous or corrugated in horizontalcross section and which comprise upper and lower wear plates or sections41* and an intermediate wear plate or section M The apices of thecorrugations of the swing jaw wear plates are staggered with respect tothe apices or meshed with the valleys of the corrugations of thestationary jaw wear plates, as clearly illustrated in Figure 1 of thedrawings so that material to becrushed may, upon bridging the apices ofone set of wear plates, be forced or urged therebeyond or therebetweenby the apices of the other set of wear plates to break down the bulkmaterial into small particles. The surfaces 42 of the upper and lowerwear plates of the swing jaw are inclined or tapered away from the planeof the surface of the swing jaw intermediate wear plate so that theycommence in alignment with the swing jaw intermediate section surface 42and diverge away therefrom in an inclined manner toward the front wall.35, as indicated by the reference character 43. In this manner and byreason of this arrangement, therefore, it will be noted that the swingjaw wear plate not only assists in defining a hopper of considerableextent or capacity for the reception of material to be crushed, but alsothe sinuous surface of the lower wear plate 41 is in close proximity tothe stationary jaw to transmit substantially horizontal crushing forcesto the material interposed between the jaws efiectivaly to break down.the material into small particles. Further, the swing jaw upper andlower wear plates may be transposed so that after considerable wear hastaken place in the lower wear plate, it may be moved to the locationoccupied in the illustration by the upper wear plate where it will not.be sub- J'ected to such severe surface wear forces and the upper. wearplate may be moved to occupy the space as illustrated. now by the lowerwear plate. Since the upper and. lower wear plates of the swing jaw arealso counter-parts of one another, a transposition of these wear plateswill also function materially to increase the service lifeof themachine.

Like the attaching means for the: stationary jaw upper wear plate, theswing jaw upper wear plate has associated therewith a top wedge 2?.interposed between a shoulder 44- formed on the front wall 36 and theuppermost extremity of the associated upper wear plate to assist inlocking the latter against aninward and upward movement from itsillustrated position. The top wedge is secured to the swing jaw by meansof bolts 2 l or any other suitable locking device. Securing means suchas the illustrated bolts 23*" are employed to assist the top wedge 22 inretaining the upper wear plate as well as the intermediate wear plate ofthe swing jaw in operable position. The flange-like shelf 38 has akeyway 25 opening toward the hopper to accommodatea key 2'! outstandingfrom a toe lug 26 the latter of which is in wedging engagement with thelowermost extremity of the swing jaw lower wear plate to prevent itsdownward and inward shifting from the illustrated position. Rivets 28are employed to secure the toe lugs 26 to the flange-like shelf. andassisting the toelug 2!; are a plurality of. bolts 23 spaced verticallytherefrom and disposed horizontally of the swing jaw to maintain thelower wear plate thereof in a fixed predetermined position. To preventthe upper and lower wear plates of the swing jaw from shifting laterallyas well as to relieve the securing means thereof from transverse servicethrusts, there is provided. on these wear plates vertically spaced shearlugs 29 which extend into suitably formed or accommodating recesses 39.It will be noted, that the shelf 38 is angularly inclined to thevertical, being disposed preferably in. the same general direction asthe front wall 36, and accordingly any forces tending tov urge the swingjaw wear plates downwardly will create shear stresses only in the key27*, thereby subjecting the rivets 28 to tensional stresses only with noor very little reliance being made on the rivets 28 to overcome a.shifting action of the overlying. or associated wear plate.

So as to relieve the housing side walls of wear, and particularly thatportion thereof which defines the transverse limits of the hopper, therehave been provided wear plates 45 removably secured to the side wallsin. the. proximity of the hopper by means of boltsv 46 or any electedse-- curing means. Bosses 41 and N outstand from the housing sidewallsto afford greater bearing areas for the bolts 46. The side wall webs,adjacent the area occupied by the stationary jaw, are, during service,subjected to substantially concentrated forces, and in order tostrengthen the side walls about this area there have been provided aseries of vertically spaced longitudinally or horizontally directed ribs4.8- which connect or join. the bosses l8 and 41 to extend a trifle be--yond the latter, where they merge with the side wall web short of thebosses 47 Additional ribs 49 are interposed between the bosses to extendto a position substantially midway of the side walls. Both sets of ribsare desirably thickened where they pass or bridge the opposite side ofthe web carrying the grooves Hi to additionally reinforce the webs inthese areas.

Means has been provided on the swing jaw to protect the top bearing 35thereof against wear to which it will be otherwise subjected by thematerial deposited in the hopper, and as exemplary of such a means aforwardly facing lip 50 is formed on the top bearing with which isassociated a striking or buffer plate or shield 5!. The shield, adaptedto direct the material into the hopper, is secured to the swing jawthrough the medium of suitable bolts 52.

A driving mechanism is arranged with the housing to oscillate the swingjaw in a material crushing action. This mechanism is illustrated in thedrawings by a main 01' drive axle 53 which is rotatably associated withand supported by suitable bearings 54 formed in and removably secured tothe housing forming side walls adjacent their upper extremities andintermediate their ends. The drive axle, spanning the spaced housingforming side walls, has its extremities 55 extending beyond the bearings54 to present extensions to which are splined power means such asdriving or fly wheels or pulleys 55. The drive axle has, intermediatethe ends thereof, a portion 5! formed eccentric with the extremitiesthereof which, in effect, forms a crank arm for the driving mechanism.Associated with the eccentric is a pitman comprising a box including aplurality of, preferably two, segmental or half top and bottom bearings53 and 58, res ectively,'wh.ich are secured together in circumambientrelation with the eccentric by means of locking bolts 63. The segmentalbearings are freely movable or rotatable relative to the eccentric andhave, interposed therebetween, the usual adjusting shims 6! whichcompensate for any initial variation between the segmental bearings andeccentric as well as for any wear which might take place therein duringservice.

Extending downwardly of the pitman box are a plurality of, preferablyfour, pitman rods 82 each of which is provided with an upper upsetportion or shoulder 63 intermediate its ends. The shoulder 63 ispreferably in bearing relation with the underneath surface of the topsegmental bearing, and for the accommodation of the rods, the bottomsegmental bearing is recessed or relieved, as at B4, in the immediatearea about the shoulder 53, reference being made particularly to Figure2' of the drawings. The upper extremities of the pitman rods areprovided with suitable locking means, such as nuts 55, so that the rodsare securely fastened to only the top segmental bearing. From the above,therei ore, it will be noted that adjustments may be made to thesegmental bearings by adding to or removing from the illustrated shimswithout disturbing the pitman. This adjustment may be made by removingthe locking bolts Ell, which permits a downward removal of the bottomsegmental bearing to make the necessary adjustments, and a reversal ofthe enumerated steps will place the eccentric bearing in assembledrelation so that at no time during the adjustment procedure will thepitman connection be disturbed.

Spaced an appreciable or predetermined distance below the eccentric orpitman box is a pitman head 66 formed in part by transversely spacedbridge members or stanchions 67. The lower ends of the pitman rods whichhave shoulders or upset portions 63 bearing against the bridge membersextend through suitable apertures in the members and are rigidlyconnected thereto by rotatable locking means, such as the nuts 69.Spanning or joining the lower extremities of the bridge members anddesirably formed integral therewith is a Y-shaped lower tie bar 10having upwardly facing or diverging surfaces ii inclined or angularlydisposed relative to one another to present a V-shaped surface formationin cross section. Spaced a predetermined distance above the tie bar is atop connecting plate l2 also extended between and preferably formedintegral with the bridge members. The top connecting plate is invertedL-shaped in cross section and has a vertical leg i3 thereof presentingan inclined face 75 angularly disposed relative to one of the surfacesTI and parallel relative to the other surface H. Associated with the topconnecting plate and preferably in subjacent relation to alongitudinally directed leg 15 thereof is a removable member orretaining bar 16 having a surface ll thereof angularly disposed to thesurface M and forming therewith an inverted V-configuration when viewedin cross section, reference being made particularly to Figure 3 of thedrawings. The retaining bar is removably secured to the top connectingplate leg l3 by means of bolts 78. Interposed between the lower tie barand the top connecting plate and retaining bar is a shoe or wear block'19 having angularly disposed or V-shaped surfaces 19 thereof paralleland in bearing relation with the inclined surfaces H, M and H to clampthe shoe in a fixed predetermined position.

Force transmitting means has been provided in the driving mechanism toimpart a motion to the swing jaw, and as exemplary of such a means, ajaw toggle arm at. slightly inclined with respect to a horizontal plane,extends between the pitman head and swing jaw. For the accommodation ofthe toggle arm, a cylindrical socket 8!, carried by the rear wall 3'! ofthe swing jaw, seats an associated cylindrical extremity I82 of thetoggle arm, and a similar cylindrical socket 8 l is provided in the shoeintermediate its height so as to face outwardly thereof and form a seatfor a correspondingly formed extremity 52 of the toggle arm. It will benoted, therefore. that the toggle arm 89 is freely movable in itsaccommodating sockets within certain predetermined limits.

Extending between what may be considered the rear extremity of thehousing side walls is a rear beam or bulkhead I of skeletonized formcomprising longitudinally spaced front and rear vertical wall 9 and Illrespectively, which are united adjacent their top and bottom edges bywebs N and H, respectively,- and adjacent their side edges by end websI2 The front and rear walls of the rear bulkhead are' reinforced byvertically spaced intermediate webs l3 which also merge with theassociated side webs. Shear lugs I l are arranged to oustand from therear bulkhead side webs to extend into suitably dis-' By referringparticularly to Figure 1 of the drawings, it will be noted that the sidewall webs are bulged or thickened, as at Ili adjacent the areas of thegrooves to compensate for the portion of the side wall webs removed bythe introduction of the grooves.v The rear bulkhead is secured to theside walls by means'of transversely extending tie rods Il which extendthrough bosses iB formed on the side wall webs to outstand therefrom.Vertically spaced and longitudinally directed ribs it connect the bossesill to extend therebeyond a predetermined distance toward the center ofthe housing to reinforce the side wall webs. Ribs M interposed betweenthe bosses, extend toward the other extremity of the housing where theymerge with the aligned ribs 49 with both the ribs 58* and Mi beingpreferably thickened where they pass the transverse extended plane ofthe grooves I5 to additionally reinforce the webs about the area of thegrooves.

Brackets or supporting shelves 83 are formed integrally with the sidewall webs to extend inwardly of the housing therefrom. A tail piece orblock 84, positioned in subjacent relation with respect to the brackets,is supported thereby through the bolts 85. Shims 86 are interposedbetween the tail piece and brackets so that the bearing blocks may beadjusted vertically. The tail piece is also arranged to react againstthe rear bulkhead and is removably secured thereto by means of bolts 81which extend through the rear bulkhead front and rear webs. Shims 8 8are interposed between the tail piece and front web 9* so that the tailpiece may be adjusted or shifted horizontally, as desired. By reason ofthe present construction and association of parts the effective lengthsof the bolts 85 and 3'! may be varied so as to add additional shims 86and 88 as the surfaces 8| and 82 wear during service. Also the bolts canbe removed without dismantling in case of breakage. The tail piececarries a cylindrical outwardly facing cavity Bi which accommodates acorrespondingly formed surface 82 forming an extremity of a toggle armor lever (w The opposite extremity of the toggle lever has an outwardlyfacing cylindrical surface 82 which is seated in a cylindrical socket8|, the latter of wiiich is formed in the wear block or shoe l9,desirably in the same horizontal plane as the socket 81 The toggle lever89* is slightly inclined with respect to a horizontal plane, and, aswill be noted, the axes of the toggle arms 80 and 8| intersectsubstantially on the vertical axis of the pitman so that no turningmoments will be created in the pitman.

It will be noted that both toggle arms are inclined downwardly towardtheir connection to the pitman head so that they may at no time reach adead center and that the pitman is illustrated in its foremost elevatedposition. Accordingly, a rotary motion of the drive axle fromillustrated position will result in a lowering of the pitman and thusenable the swing jaw to move away from the stationary jaw. When thepitman, by reason of the rotation of the eccentric, reaches itslowermost position and is again urged upwardly, the swing jaw will beforced toward the stationary jaw to crush material deposited between thejaws. Upon such an upward movement of the pitman only tensional. forcesare created in the pitman arms.

I The junctures between the toggle arm extremities and sockets areprotected against dirt or any foreign substance entering therein bymeans of overlying aprons or covers 89 each of which desirably comprisesa flexible skirt 95 anchored to a related element through the medium ofa bracket 9|.

Stops S2, suitably spaced, are provided in the machine so that if thetoggles are subjected to such strains as to result in failure of one orboth of the toggles, the swing jaw will only move through apredetermined arc and stop short of the pitman, thereby ensuring thelatter against damage by the swing jaw through the failure of eithertoggle.

From the preceding description, considered together with theaccompanying drawings, it will be noted further that various changes andalterations may be made to the illustrated form of the invention withoutdeparting from within the spirit and scope of the appended claims.

I claim:

1. In a crushing machine of the type having a housing formed by spacedside walls with a drive axle spanning and journaled to said walls, astationary jaw and a swing jaw, the combination of a bearing blockspaced from said stationary jaw, means for actuating said swing jawcomprising an eccentric formed on said drive axle, a verticallyadjustable pitman having a box formed by segmental top and bottombearings encircling said eccentric, a head spaced from said box andinterposed between said swing jaw and bearing block, means extendingbetween said swing jaw and bearing block and head, a plurality of rodsjoining said segmental top bearing and head, said head having a lowertie bar Y-shaped in vertical cross section, and a top connecting plateinverted L-shaped in vertical cross section, a wear block interposedbetween said tie bar and top connecting plate, and a retainer barremovably secured to said top plate and adapted to maintain said wearblock in fixed position.

2. In a crushing machine of the type having a housing formed by spacedside walls with a drive axle spanning and journaled to said walls, astationary jaw and a swing jaw, the combination of, a bearing blockspaced from said stationary jaw, means for actuating said swing jawcomprising an eccentric formed on said drive axle, a verticallyadjustable Ditman having a box formed by segmental top and bottombearings encircling said eccentric, a head spaced from said box andinterposed between said swing jaw and bearing Y shaped in vertical crosssection and an integral top cross connecting plate of inverted L shapein vertical cross section, a removable wear block interposed between andcontacting said bar and plate, and a retainer bar removably secured tosaid top plate and adapted by contact therewith to also maintain saidwear block in fixed relation.

3. In a crushing machine of the type having a housing formed by spacedside walls with a drive axle spanning and journaled to said side walls,a stationary jaw and a swing jaw, the combination of, means foroscillating said swing jaw comprising an eccentric formed on said driveaxle, a pitman having a box formed by segmental top and bottom bearingsencircling said eccentric, a head spaced from said box, a plurality ofrods joining said segmental top bearing only and said head, said headhaving integrally formed top and bottom cross members, a removablecentral shoe having wedge shaped surfaces engaging correspondinglydisposed surfaces on said members, and a bar removably secured to one ofsaid members for retaining said central shoe in fixed position.

4. In a crushing machine of the type having a housing formed by spacedside walls with a drive axle spanning and journaled to said side walls,a stationary jaw and a swing jaw, the combination of, means foroscillating said swing jaw comprising an eccentric formed on said driveaxle, a pitman having a box formed by segmental top and bottom bearingsencircling said eccentric, a head spaced from said box, said head havingtransversely spaced stanchions, a plurality of rods joining saidsegmental top bearing and stanchions, a lower cross bar extendingbetween said stanchions, a cross connecting plate spaced from said crossbar and extending between said stanchions, a removable wear blockinterposed between and contacting said bar and plate, and

a retainer bar removably secured to said top plate and adapted tocontact said wear block for retaining it in fixed position.

5. In a crushing machine of the type having a housing formed by spacedside Walls with a drive axle spanning and journaled to said side walls,a stationary jaw and a swing jaw, the combination of, means foroscillating said swing jaw comprising an eccentric formed on said driveaxle, a pitman having a box formed by segmental top and bottom bearingsencircling said eccentric, a head spaced from said box, said headcomprising transversely spaced vertically disposed stanchions, aplurality of rods joining said segmental top bearing only and saidstanchions, a lower cross bar connecting and formed integrally with saidstanchions, a top connecting plate formed integrally with and extendingbetween said stanchions, a removable wear block interposed between andcontacting said bar and plate, and a retainer bar removably secured tosaid top plate and adapted to maintain said wear block in fixedposition.

6. In a crushing machine of the type having a housing formed by spacedside walls and a drive axle spanning and journaled to said side walls, astationary jaw and a swing jaw, the combination of, means foroscillating said swing jaw comprising an eccentric formed on said driveaxle, a pitman having a box encircling said eccentric, a head spacedfrom said box, said head having transversely spaced stanchions, a.plurality of rods joining said box and stanchions, a bar memberextending between and connected to said stanchions, a plate memberextending between and connected to said stanchions in spaced relation tosaid bar member, angularly disposed surfaces on said members, aremovable wear block interposed between said members and havingangularly dispOsed surfaces in bearing relation with said first namedsurfaces, and a retaining bar removably secured to one of said membersand adapted by contact therewith to maintain said wear block in fixedposition.

EDWARD T. PETERSON.

